Isotherms of equivalent conductivity, activation energy of ionic migration and molar volume show only slight deviations from linearity for the systems NaN02 + NaN03 CdI2 + CdC12 and KI + NaCl in which the phase diagrams indicate that no intermediate phases occur in the solid state. Similar effects are observed for the system KN03 + KBr for which the phase diagram indicates the formation of incongruently melting KNO3 . KBr.Hence, in all four systems, the molten mixtures do not exhibit any appreciable increase of covalent character compared with the individual molten constituents.
/ Analyses of the concentrations of Cd, Cr, Co, Cu, Fe, Pb, Mn, Hg, Ni, and Zn in filtered waters, suspended particulates, sediments, shellfish, fish, airborne particulates, and sewage have confirmed work of other investigators showing that the Derwent Estuary is heavily contaminated, particularly with mercury, cadmium, lead, and zinc, and have added further information regarding the distribution of each metal. Apparently most of the contamination originated from the earlier operation of a zinc refining plant. A study of shellfish growing in variously contaminated regions found that more than 20 species could be listed in order of their respective abilities to accumulate each heavy metal. For example, the mussel (Mytitus edulis) was found to be a good indicator of cadmium and mercury contamination, but less valuable as an indicator of zinc. The surf barnacle, (Catophragmuspolymerus) was found to be one of the
The surface tensions over temperature ranges of about 200" have been ineasurcd for pure molten salts and the following systems : NaN03fNaN02, KN03fKNQ2, NaNQ3f AgN03, KN03fAgN03, PbC12SNaCl and KCl+NaI. Parachor and Eotvoes' constant considerations cannot be applied validly to molten salts. The surface heat content per unit area is a useful, temperature-independent quantity which can be used to compare molten salts. For mixtures, the surface heat of mixing has been calculated for the above systems and for the RbClSPbCl2 and CdC12+KCI systems. This property gives further evidence for the formation of complex ions in certain systems.
The thermal conductivity of the molten
salts NaNO3, KNO3, AgNO3, and NaNO2
was measured by an equilibrium method over a range of temperature. Similar
measurements were carried out for the NaNO3
+ KNO3, AgNO3 + NaNO3, and AgNO3
+ KNO3 systems. The free volume of molten salts has been
calculated from thermal conductivity and is compared with results from sound
velocity determinations.
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